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      Water adsorption behaviour of CAU-10-H: a thorough investigation of its structure–property relationships

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          Abstract

          Aluminium isophthalate CAU-10-H is a promising stable adsorbent for application in heat-exchange processes.

          Abstract

          Aluminium isophthalate CAU-10-H [Al(OH)(benzene-1,3-dicarboxylate)]· nH 2O exhibits water adsorption characteristics which make it a promising adsorbent for application in heat-exchange processes. Herein we prepared a stable coating of this MOF and evaluated its long-term stability under closed-cycle conditions for 10 000 water adsorption and desorption cycles, which are typical lifetimes for adsorption heat storage (AHS) applications. No degradation of the adsorption capacity could be observed which makes CAU-10-H the most stable MOF under these humid cycling conditions reported until now. Moreover, thermophysical properties like thermal conductivity and heat of adsorption were directly measured. In order to identify the structural features associated with the adsorption behaviour, the structural differences between the dry and the water loaded CAU-10-H were studied by Rietveld refinements and second harmonic generation (SHG) microscopy. The observed transition of space group symmetry from I4 1 to I4 1/ amd between the humid and dry forms is induced by the adsorption/desorption of water into/out of the MOF channels. This originates from a torsional motion around the C–C bond between the carboxylate groups and the aromatic ring in half of the linker molecules. These observations are in excellent agreement with molecular dynamics simulations which confirm the energetic benefit of this transition.

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          Most cited references57

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          Hydrogen storage in metal-organic frameworks.

          New materials capable of storing hydrogen at high gravimetric and volumetric densities are required if hydrogen is to be widely employed as a clean alternative to hydrocarbon fuels in cars and other mobile applications. With exceptionally high surface areas and chemically-tunable structures, microporous metal-organic frameworks have recently emerged as some of the most promising candidate materials. In this critical review we provide an overview of the current status of hydrogen storage within such compounds. Particular emphasis is given to the relationships between structural features and the enthalpy of hydrogen adsorption, spectroscopic methods for probing framework-H(2) interactions, and strategies for improving storage capacity (188 references).
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            Industrial applications of metal-organic frameworks.

            New materials are prerequisite for major breakthrough applications influencing our daily life, and therefore are pivotal for the chemical industry. Metal-organic frameworks (MOFs) constitute an emerging class of materials useful in gas storage, gas purification and separation applications as well as heterogeneous catalysis. They not only offer higher surface areas and the potential for enhanced activity than currently used materials like base metal oxides, but also provide shape/size selectivity which is important both for separations and catalysis. In this critical review an overview of the potential applications of MOFs in the chemical industry is presented. Furthermore, the synthesis and characterization of the materials are briefly discussed from the industrial perspective (88 references).
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              Engineering coordination polymers towards applications

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                Author and article information

                Journal
                JMCAET
                Journal of Materials Chemistry A
                J. Mater. Chem. A
                Royal Society of Chemistry (RSC)
                2050-7488
                2050-7496
                2016
                2016
                : 4
                : 30
                : 11859-11869
                Affiliations
                [1 ]Fraunhofer Institute for Solar Energy Systems ISE
                [2 ]79110 Freiburg
                [3 ]Germany
                [4 ]Institut für Anorganische Chemie und Strukturchemie
                [5 ]Heinrich-Heine-Universität Düsseldorf
                [6 ]School of Chemical Engineering
                [7 ]National Technical University of Athens
                [8 ]157 80 Athens
                [9 ]Greece
                [10 ]KU Leuven Centre for Surface Chemistry and Catalysis
                [11 ]University of Leuven
                [12 ]3001 Leuven
                [13 ]Belgium
                [14 ]Institute of Inorganic Chemistry
                [15 ]Christian-Albrechts-University Kiel
                [16 ]D-24118 Kiel
                [17 ]Catalysis Engineering
                [18 ]Department of Chemical Engineering
                [19 ]Delft University of Technology
                [20 ]van der Maasweg 9, 2629Hz Delft
                [21 ]The Netherlands
                [22 ]Institute for Medical Engineering and Science
                [23 ]40225 Düsseldorf
                Article
                10.1039/C6TA01757F
                18b5e2fc-b8b6-4451-842e-92ae49b0f115
                © 2016
                Product
                Self URI (article page): http://xlink.rsc.org/?DOI=C6TA01757F

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